Re: Optimizing

[Jonathan Wakely <jwakely.gcc@gmail.com>]

On 30 January 2011 20:40, Enrico Weigelt wrote:
> * Kalle Olavi Niemitalo <kon@iki.fi> wrote:
>
>> Although the second parameter is const void *, the language still
>> allows the function to modify the object to which that points,
>> provided that the object was not defined as const.
>
> Doesn't that defeat the whole purpose of const ?

No. http://www.gotw.ca/gotw/081.htm


> BTW: let me add another question:
>
>
>    const std::string str;
>
>    void one(const std::string s)
>    {
>        str = s;
>    }
>
>    void two(const char* s)
>    {
>        one(s);
>    }
>
>    void three()
>    {
>        two("hello world");
>    }
>
>
> What actually happens here under the hood ? Is this reliable ?
> (lifetime of the string object)

It won't compile because you assign to a const, so I don't understand
the question.